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    <meta charset="UTF-8">
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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS盒子模型使用</title>
    <link rel="stylesheet" href="css_five.css">
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<body>
    <h1>h1-块级盒子</h1>
    <p>p-块级盒子</p>
    <pre>pre-块级盒子</pre>
    <div>div-块级盒子</div>
<!-- 内联盒子并不会推开非内联盒子 -->
<!-- 盒子可以通过改变display属性的设置，来改变盒子的显示 -->
    <span>span-内联盒子</span>
    <span>span-内联盒子</span>
    <a href="#">a-内联盒子</a>
    <b>b-内联盒子</b>

    <div class="box_before">盒子之前</div>
    <div class="box">盒子</div>
    <div class="box_after">盒子之后</div>

    <div class="box_outline">
        <div class="box_size">2<br>2<br>2<br>2<br>2<br>2<br></div>
    </div>
    <div class="box_outline">
        <div class="box_margin"></div>
        <div class="box_margin2"></div>
    </div>

    <div class="out_line">
        <p>1</p>
        <p>2</p>
        <p>3</p>
    </div>
   
</body>
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